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General >> Hangar talks >> Lou - STORIES
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Message started by JayG on Feb 21st, 2011 at 5:11pm

Title: Re: Lou - STORIES
Post by LOU on Apr 9th, 2011 at 9:21pm
Time to answer the puzzler by pj747...

Now what one feature does the 767 differ from the 757 and all other Boeing jets that can cause a major problem after total battery failure?


If you lose all generators, then run the battery out in the 767, you will not be able to lower the gear. I'm guessing this is the difference you are referring to.

The reason is because you will lose both electric hydraulic pumps on the center hydraulic system, which powers the gear.

When the battery runs out, you will lose the air driven pump on the center system because the air driven pump valve requires 28v DC to remain open.

You have now lost the entire center hydraulic system and you can't lower the gear normally.

The alternate gear extension uses a 28v DC motor to mechanically unlock the gear. If you have no 28v DC, that option disappears also.

More reading:
http://www.smartcockpit.com/data/pdfs/plane/boeing/b767/instructor/B767_Electrical.pdf





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